1、以flask登陆检测作为示例

from functools import wraps
from flask import session, g, jsonify
def login_required(callback=None, *args_, **kwargs_):
    def wrapper(func):
        def decorated_view(*args, **kwargs):
            user_id = session.get('user_id')
            if user_id is not None:
                g.user_id = user_id
                return func(*args, **kwargs)
            else:
                if callback:
                    return callback(*args_, **kwargs_)
                return jsonify(errno='403', errmsg='用户未登录')
        return decorated_view
    return wrapper

用法：

def not_login_callback():
    """
    未登录回调
    :return:
    """
    return '403'
    
@app.route('/upload', methods=['GET', 'POST'])
@login_required(not_login_callback)
def upload():
    """
    上传文件：需要验证登录，未登录需要跳转登录
    :return:
    """
    from WEB.router.file import upload
    app.config['UPLOAD_FOLDER'] = upload.UPLOAD_FOLDER
    return upload.upload_file('file/upload-form.html')

完毕！